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What is the reason for the blockage of the expansion tank ventilation pipe

(Summary description)When the engine is cold and the coolant is filled, the air in the engine water jacket and the radiator cannot be discharged in time due to the blockage of the vent pipe, so that the coolant cannot fill the entire system,

What is the reason for the blockage of the expansion tank ventilation pipe

(Summary description)When the engine is cold and the coolant is filled, the air in the engine water jacket and the radiator cannot be discharged in time due to the blockage of the vent pipe, so that the coolant cannot fill the entire system,

Information

1. When the engine is cold and the coolant is filled, the air in the engine water jacket and the radiator cannot be discharged in time due to the blockage of the vent pipe, so that the coolant cannot fill the entire system, and it seems that the coolant in the expansion tank has been filled. In fact, the water jacket of the engine and the radiator are in a half-empty state, which causes the coolant to not circulate normally, and the temperature of the engine rises rapidly. Often, the cooling system "opens the pot" and sprays water, but the coolant cannot be replenished.

2. Although the engine has been filled with coolant, due to the blockage of the vent pipe during use, especially when the vent pipe connected to the front of the engine thermostat is blocked, during the operation of the engine, with the gradual increase of the coolant temperature , some steam will be generated. If these steam accumulate above the radiator, it will hinder the flow of coolant and affect the heat dissipation effect; if these steam accumulate in front of the thermostat, the thermostat will be separated from the coolant, and the main valve of the thermostat cannot follow the When the temperature of the coolant increases, it is opened in time, and the formation of air resistance causes the large circulation of the coolant to be unable to be carried out effectively, so the engine often has an excessively high temperature. The buildup of steam can also displace coolant, creating an expansion tank overflow condition.
 

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